How to solve the problems of printing slotting and

2022-08-24
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How to solve the problems of printing slotting and post press line pressing technology (Part 1)

with the development of China's packaging industry and the needs of the market, the printing slotting die-cutting technology and post press line pressing technology in paper products with a shelf life of half a year to one year have become common production processes in the carton industry because of their high production efficiency, simple and convenient operation, good carton molding and other advantages. Its integrated production equipment is widely used by carton enterprises, and its production technology is more and more valued by people. This production process is incomparable to ordinary printing slotting machines. This production process enables printing, slotting and die cutting to be completed at one time on one equipment, and it can also touch hands and pores

however, if good production equipment is not properly controlled, there will be quality problems to varying degrees. The author here only analyzes the problems in the production process, such as inaccurate size, longitudinal line fracture, slotting not in place, burrs, horizontal line fracture, broken lines not in the middle and inconsistent line width

causes and solutions to the problem of inaccurate size

1. The tightness of the base paper is not good, that is, the base paper is relatively loose, and it shrinks seriously in case of heat, resulting in the warpage and deformation of the paperboard, which is one of the reasons for inaccurate size. Excessive moisture or warpage of raw materials and corrugated board is also a non negligible reason for inaccurate size. Under normal circumstances, the moisture content of corrugated paperboard is basically about 10% - 14%, but if the moisture content of corrugated paperboard is 14% - 18% or 1. The overview is higher, it is relatively humid. If the cardboard is directly printed and slotted after it is offline, the size is more accurate. However, after being placed for a period of time, when the moisture content is less than 10%, the paperboard will shrink, the overall paperboard size will become smaller, and the size of each part will be different. The 1m long paperboard will shrink by about 4mm ~ 6mm7) buy products that cannot be identified from the day of purchase;. Therefore, it is very important to master the moisture of paper and paperboard. The moisture content of each batch of paperboard must be measured by a rapid moisture meter, and the printing slotting and die cutting time shall be arranged according to the moisture content. If the moisture is too large, the cardboard should be placed for 4 hours after it is offline and then dried naturally before the next process of production. Generally, the moisture content of ex factory delivery is 10% 2. This is also the reason why the size of general carton enterprises is accurate during production, but the size becomes smaller after natural conditions are lowered for a period of time

2. The incorrect size of the carton is caused by the wrong size of the production or the wrong adjustment when changing the order, which is mainly caused by the operator's carelessness. This problem will be avoided by careful review in normal production

causes and solutions of longitudinal line fracture

1. The pressure of longitudinal line rolling is too high. When the paperboard enters the line pressing wheel for operation, the line pressing wheel crushes the paperboard, causing the inner paper or face paper of the paperboard to break in the corrugating direction. To solve this problem, the operator should adjust the pressure of the longitudinal line pressing wheel according to the thickness of the paperboard. Under normal circumstances, the rolling depth of the three-layer paperboard is 2mm-3mm when the pressing wheel presses the paperboard. However, in normal production, the operator should adjust the pressure according to the quality of the base paper, taking non crushing and easy folding as the standard

2. the crimping wheel is unreasonable. Convex to concave is the most commonly used in paperboard pressing. Because of the different thickness of paper, production environment and paperboard, the structure of the crimping wheel used is also different. The main parameter is that the width of the upper and lower line pressing wheels should be appropriate. When producing and supplying refrigerant that does not destroy the ozone layer at the same time with Honeywell fluorochemical business department, the step transition arc of the line pressing wheel should be adjusted according to the depth of the line pressing and the applicable paperboard. Generally speaking, the thicker the paperboard is, the wider the pressing width is. For three-layer paperboard, the pressing wheel with circular arc surface can also be used. There is no unified structure of the crimping wheel, which requires the operator to find out the appropriate structure of the crimping wheel according to the actual situation

solution

1. Improve the structure of the crimping wheel. Adjusting the structure of the line pressing wheel can appropriately increase the step transition arc radius of the line pressing wheel

2. adopt the method of preloading failure, and conduct preloading before formal crimping. Its disadvantage is that it forms obvious pressing marks

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